scholarly journals Induced velocities outside the ideal propeller jet

2021 ◽  
Vol 3 (397) ◽  
pp. 33-44
Author(s):  
Kotlovich V. ◽  

Object and purpose of research. The paper is devoted to the analysis of induced flow velocities outside the ideal propeller jet. The purpose is to widen capabilities of estimations. Materials and methods. Analysis of data on this issue has shown that complicated and quite labor-consuming methods are used for these purposes. It is attempted to devise a calculation scheme based on direct determination of induced velocities from discrete sinks simulating the ideal propeller. For this purpose an algorithm and software is developed for PC implementation. Testing of the computer program allowed us to define conditions ensuring the accuracy of calculations, it confirmed practically full agreement with the data obtained by other authors and possibility for widening the range of its application. Main results. Systematic calculations of induced velocities outside the ideal propeller jet were done allowing us to determine the flow velocity at any point of a wide area for engineering purposes. Conclusion. Longitudinal and radial component velocities induced by ideal propeller outside its jet were calculated based on directly assessed influence of the system of sinks distributed over the propeller disk on the ideal fluid flow. The algorithm for calculations was developed, the software was written and tested. Systematic calculations of induced velocities were done, which could be used for practical estimations.

2018 ◽  
Vol 130 (9) ◽  
pp. 2372-2376 ◽  
Author(s):  
Andreas Ermantraut ◽  
Valentin Radtke ◽  
Niklas Gebel ◽  
Daniel Himmel ◽  
Thorsten Koslowski ◽  
...  

2018 ◽  
Vol 130 (9) ◽  
pp. 2368-2371 ◽  
Author(s):  
Valentin Radtke ◽  
Andreas Ermantraut ◽  
Daniel Himmel ◽  
Thorsten Koslowski ◽  
Ivo Leito ◽  
...  

2018 ◽  
Vol 57 (9) ◽  
pp. 2344-2347 ◽  
Author(s):  
Valentin Radtke ◽  
Andreas Ermantraut ◽  
Daniel Himmel ◽  
Thorsten Koslowski ◽  
Ivo Leito ◽  
...  

1978 ◽  
Vol 48 ◽  
pp. 287-293 ◽  
Author(s):  
Chr. de Vegt ◽  
E. Ebner ◽  
K. von der Heide

In contrast to the adjustment of single plates a block adjustment is a simultaneous determination of all unknowns associated with many overlapping plates (star positions and plate constants etc. ) by one large adjustment. This plate overlap technique was introduced by Eichhorn and reviewed by Googe et. al. The author now has developed a set of computer programmes which allows the adjustment of any set of contemporaneous overlapping plates. There is in principle no limit for the number of plates, the number of stars, the number of individual plate constants for each plate, and for the overlapping factor.


1961 ◽  
Vol 41 (4) ◽  
pp. 380-384 ◽  
Author(s):  
Arthur F. Dratz ◽  
James C. Coberly
Keyword(s):  

2002 ◽  
Vol 721 ◽  
Author(s):  
Monica Sorescu

AbstractWe propose a two-lattice method for direct determination of the recoilless fraction using a single room-temperature transmission Mössbauer measurement. The method is first demonstrated for the case of iron and metallic glass two-foil system and is next generalized for the case of physical mixtures of two powders. We further apply this method to determine the recoilless fraction of hematite and magnetite particles. Finally, we provide direct measurement of the recoilless fraction in nanohematite and nanomagnetite with an average particle size of 19 nm.


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